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[Solved] SoftEther speed is too slow

Posted: Wed Aug 04, 2021 4:41 pm
by juny1209
Hello. I'm using Vultr VPS. I installed CentOS 7 and SoftEther, and I enabled SecureNAT.
But.. the speed of SoftEther is too slow. I tried SoftEther Client and SoftEther bridge.

But, other VPN program speed is very fast although OpenVPN of SoftEther.

In case, My home network maximum bandwidth is 500Mbps and tested by famous network benchmark service in this region.

Normal(Not connecting VPN)
-> Down 500Mbps / Up 495Mbps

Using SoftEther Client with SecureNAT
-> Down 0.5Mbps / Up 180Mbps

Using Outline VPN
-> Down 480Mbps / Up 450Mbps

Using OpenVPN included in SoftEther with SecureNAT
-> Down 480Mbps / Up 480Mbps

Almost of VPN are very fast but only SoftEther is very slow.

Because the speed of OpenVPN included in SoftEther is very fast, I think SecureNAT is not reason of this problem.

I tried "No Encryption", TCP connection to 32 and cascade with my home server, but no effect existed.

Could someone give me some feedback or hint? I should use SoftEther for some reasons. Thanks!

Re: SoftEther speed is too slow

Posted: Sat Aug 07, 2021 5:20 pm
by juny1209
It was SecureNAT problem. I try OpenVPN today, It slow too. solved

Re: [Solved] SoftEther speed is too slow

Posted: Tue Aug 10, 2021 2:40 am
by guestofhonor
Hello juny1209,

Could you please explain how you were able to fix the issue since i'm facing the exact same issue.

Thanks in advance

Re: [Solved] SoftEther speed is too slow

Posted: Sat Oct 09, 2021 4:01 am
by juny1209
guestofhonor wrote:
Tue Aug 10, 2021 2:40 am
Hello juny1209,

Could you please explain how you were able to fix the issue since i'm facing the exact same issue.

Thanks in advance
I used tap(Virtual Network Adaptor), iptables and dnsmasq. I've got the information from this link (https://damoa-nawa.tistory.com/89) The link is korean but you can use google translator. I apologize for late answer.

Re: [Solved] SoftEther speed is too slow

Posted: Mon Aug 01, 2022 9:37 pm
by lukaszos
In my case this didn't help, but maybe someone will use my solution instead:
I have 2 SE VPN servers installed on RedHat VM's working on Proxmox virtualization.
SE VPN server configuration and VM's parameters are the same, the only difference is in virtual network card.
On one server I used Intel E1000 virtual network card - on this one SE speed was OK.
On second server I used virto virtual network card - on this one download speed was around 0,2 Mb/s, upload around 10 Mb/s
After changing virtual card on second server from virtio to Intel E1000, download speed increased to ~30 Mb/s, upload speed remained at 10 Mb/s (but that's ok regarding my network connection). So the problem was in virtual network card I used.

Regards,
Lukasz